Exhibit 99.1

Entegris Reports Strong Third Quarter Results

Quarterly Sales of $178 million Marks Sixth Consecutive Quarter of Growth;

Non-GAAP EPS of $0.18; Cash from Operations Exceeds $45 Million;

Adjusted Operating Margin Reaches 18 Percent

BILLERICA, Mass., October 26, 2010 – Entegris, Inc. (Nasdaq: ENTG) today reported its financial results for the Company’s third quarter ended October 2, 2010.

The Company recorded third-quarter sales of $178.2 million, an increase of 61 percent over the prior year, and 6 percent sequentially. Net income was $22.4 million, or $0.17 per diluted share. These results included amortization of intangible assets of $2.8 million.

Non-GAAP earnings per share of $0.18 in the third quarter of 2010 compared to a loss per share of $0.02 in the third quarter a year ago and earnings per diluted share of $0.16 in the second quarter of 2010. A reconciliation table of GAAP to non-GAAP earnings (loss) per share is contained in this press release.

For the first nine months of fiscal 2010, sales were $506.3 million, up 101 percent from the first nine months of 2009. Non-GAAP earnings per diluted share for the first nine months of 2010 were $0.48 versus a loss per share of $0.43 for the same period a year ago.

Gideon Argov, president and chief executive officer, said: “Our third-quarter results marked another quarter of growth and strong operating performance, as we continue to execute our growth strategies and build shareholder value. Sales to our core semiconductor market were strong, as our liquid filtration and gas filtration businesses achieved record-level quarters. Across our portfolio of technologies, we are capitalizing on an increasing number of opportunities with our advanced filtration and microenvironment solutions to help fab customers implement advanced sub-32 nanometer processes.

“Our adjusted operating margin was 18.0 percent, consistent with our target operating model. This translated into another quarter of strong cash flow, resulting in $45 million in cash from operations and $39 million of adjusted EBITDA in the third quarter. Our net cash position is now approaching $100 million, well ahead of expectations. Thus far in the fourth quarter, demand from our customers is stable, despite the uncertain outlook for global economic recovery. Regardless of how this current industry cycle unfolds, we believe we have the opportunity to outpace our markets,” Argov said.

For the fiscal fourth quarter ending December 31, 2010, the Company expects sales to range from approximately $173 million to $183 million. Based on the Company’s target model, non-GAAP net earnings per diluted share are expected to range from $0.17 to $0.19.

Third-Quarter Results Conference Call Details

Entegris will hold a conference call to discuss its results for the third quarter on Tuesday, October 26, 2010, at 10:00 a.m. Eastern Time. Participants should dial 1-888-211-7451 (domestic callers) or 1-913-312-9323 (for callers outside of the U.S.), referencing confirmation code #9800564. A live and on-demand webcast of the call can also be accessed from the investor relations section of Entegris’ website at www.entegris.com.

ABOUT ENTEGRIS

Entegris is a leading provider of a wide range of products for purifying, protecting and transporting critical materials used in processing and manufacturing in the semiconductor and other high-tech industries. Entegris is ISO 9001 certified and has manufacturing, customer service and/or research facilities in the United States, China, France, Germany, Israel, Japan, Malaysia, Singapore, South Korea and Taiwan. Additional information can be found at www.entegris.com.

NON-GAAP INFORMATION

The Company’s consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States (GAAP). Adjusted EBITDA and Adjusted Operating Income together with related measures thereof, and non-GAAP EPS, are considered “Non-GAAP financial measures” under the rules and regulations of the SEC. These financial measures are provided as a complement to financial measures provided in accordance with GAAP. We provide non-GAAP financial measures in order to better assess and reflect operating performance. Management believes the non-GAAP measures help indicate our baseline performance before certain gains, losses or other charges that may not be indicative of our business or future outlook. We believe these non-GAAP measures will aid investors’ overall understanding of our results by providing a higher degree of transparency for certain expenses and providing a level of disclosure that will help investors understand how we plan and measure our business. The presentation of non-GAAP measures is not meant to be considered in isolation, as a substitute for, or superior to, financial measures or information provided in accordance with GAAP. The calculations of Adjusted EBITDA margin, Adjusted Operating Income, and non-GAAP EPS are included elsewhere in this release.

Forward-Looking Statements

Certain information contained in this press release may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are based on current management expectations only as of the date of this press release, and involve substantial risks and uncertainties that could cause actual results to differ materially from the results expressed in, or implied by, these forward-looking statements. Statements that include such words as “anticipate,” “believe,” “estimate,” “expect,” “forecast,” “may,” “will,” “should” or the negative thereof and similar expressions as they relate to Entegris or our management are intended to identify such forward-looking statements. These statements are not guarantees of future performance and involve risks, uncertainties and assumptions that are difficult to predict. These risks include, but are not limited to, fluctuations in the market price of Entegris’ stock, Entegris’ future operating results, other acquisition and investment opportunities available to Entegris, general business and market conditions and other factors. Additional information concerning these and other risk factors may be found in previous financial press releases issued by Entegris and Entegris’ periodic public filings with the Securities and Exchange Commission, including discussions appearing under the headings “Risks Relating to our Business and Industry,” “Risks Related to our Borrowings”, “Manufacturing Risks,” “International Risks,” and “Risks Related to Owning Our Securities” in Item 1A of our Annual Report on Form 10–K for the fiscal year ended December 31, 2009, as well as other matters and important factors disclosed previously and from time to time in the filings of Entegris with the U.S. Securities and Exchange Commission. Except as required under the federal securities laws and the rules and regulations of the Securities and Exchange Commission, we undertake no obligation to update publicly any forward-looking statements contained herein.

Entegris, Inc. and Subsidiaries

Condensed Consolidated Statements of Operations

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Entegris, Inc. and Subsidiaries

Condensed Consolidated Statements of Operations

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(Unaudited)

Entegris, Inc. and Subsidiaries

Condensed Consolidated Balance Sheets

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Entegris, Inc. and Subsidiaries

Condensed Consolidated Statements of Cash Flows

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Entegris, Inc. and Subsidiaries

Segment Information

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Entegris, Inc. and Subsidiaries

Reconciliation of GAAP to Adjusted Operating Income (Loss) and Adjusted EBITDA

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(Unaudited)

Entegris, Inc. and Subsidiaries

Reconciliation of GAAP to Non-GAAP Earnings (Loss) per Share

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